AUTO TRUCKS FUEL PUMP & VACUUM TESTER CARBURETOR VALVE PRESSURE GAUGE KIT Heavy duty gauge with protective rubber sleeve, large diameter double scale, easy to read. This tester will test the fuel pump pressure and all vacuum operated devices, it will also diagnose valve leaks, timing errors, intake pipe leaks and muffler plugging. Powerful. For connecting vacuum and fuel lines, and for most vehicles, with a wide range of applications.